Loop-spreader mechanism for sewing-machines.



PATENTED APR. 28, 1903.

M M E L K A E LOOP SPREADER MECHANISM FO R SEWING MACHINES.

APPLICATION FILED $113.28, 1901.

N0 MODEL.

FIG

INVENTOR UNITED STATES arnnr I HERMANN A. KLEMM, OF NEW YORK, N. Y.

LOOP-SPREADER M ECHANlSNI FOR SEWING-MACHINES.

SPECIFICATION forming part 'of Letters Patent No. 726,310, dated April 28, 1903.

. Application filed February 28, 1901- $erial No. $9.139. (NomodelJ To mZZ whom it may concern:

Be it known that I, HERMANN A. KLEMM, a citizen of the United States of America, and a residentof New York city, county and State of New York, have invented certain new and useful Improvements in Loop-SpreaderMechanism for SewingMachines, of which the following is a specification.

My invention consists of improvements in hook-thread-loop spreading apparatus for glove-sewing machines in which the loopinghook has lateral movement across the path of the needle for opening the hook-thread loop, which is akind of machine that is especially desirable to use for sewing gloves owing to its light and simple construction and its special adaptation for high speed,and the invention is especially adapted for overcoming a constant tendency to skip stitches, particularly when in turning the WOI'k quickly in sewing around the finger-tips the hook-thread is apt to be drawn around in the throat out of the feedline and relatively to the needle, so that the needle fails sometimes to catch the loop thread. The essential feature of my invention is, however, a more simple and cheaper contrivance of the spreader apparatus, as hereinafter described, reference being made to the accompanying drawings, in which Figure l is a side elevation of the loopinghook and its operating mechanism, also the loop spreading apparatus, the work plate presser-foot, and part of the needle. Fig. 2 is a plan View of the apparatus represented in Fig. 1. Fig. 3 is a perspective view of parts, showing the point of the hook entering the needle-thread loop and the position of the loopspreader at the same time. Fig. 4 is a similar view showing further advance of the loopingloop, so that in the beginning of its next movement the needle passes down at the other side of the hook through the hookthread loop for engaging itby the needle-thread, through the loop of which the hook passes on the next forward movement, the spreader being employed for opening the hook-thread loop reversely to the opening by the hook for such passage of the needle through it.

The hook and its operating mechanism are of common construction, butare represented in the drawings and described for better understanding of the construction and operation of the spreader, which is the subject of the claim.

The needle-operating mechanism and feed mechanism will be of common construction, which need not be shown or described further than to indicate the needle A.

The hook or is carried on a rocking pivot b, whichis mountedin the yoke-head c of a rockshaft d, to which rocking motion is communi- -cated from a cam (not shown) on the main shaft 6, through the arm f, as in other machines of like construction.

The pivot b of the hook at is coupled by the arm g and rod h with an eccentric i on the main shaft 6 in the well-known way of such machines.

The spreader consists of the notched end j of a short lateral arm of a lever Z, located on the side of the needle to which the hook shifts after taking the needle-thread loop a; and reaching backward asuitable distance toward the main shaft, where it is pivoted at m so as to swing horizontally close under the work-plate '11,, said lever having at its pivot end another lateral arm 0, extending in the opposite direction to that of the arm 7c and connected by a downwardly-extended part 11 of said arm 0, and the rodg with an eccentric s on the main shaft, by which the spreader is operated, so as to be thrust forward to engage the hook-thread loop twhen or about the time the hook begins to retire, to make wide opening for the needle and hold it until the needle has descended so far as to insure the engagement of the hook-thread loop by the needle, as shown in Fig. 6. Then the spreader retires, leaving the loop to be taken up and moving onto the beginning of its next cycle.

I am aware thata pendent stud on the under side of the work-plate has been applied in various ways, so that the hook-thread will be drawn behind it and be caught thereby when the point of the hook is outreaching so far that the thread will draw higher than the point and be for a time held to keep the loop open while the hook retires; but such spreaders are not reliable, as the loops will escape more or less earlier or later for various reasons, and it is exceedingly diflicult to adjust thelength of the stud so as to cast off the loop at the right time under all circumstances.

It will be seen that in my improved spreader there can be positive holding of the loop as long as desired and as positive release. will be seen that with this provision for simultaneously opening the hook-loops both ways the effect of so drawing the hook-thread out of line in making such quick turns of the.

What I claim as my invention is,

The combination with the needle and the looping-hook, said hook having the lateral needle avoiding movement, by which it spreads the hook-thread loops in one direction, and means for operating said needle and hook, of the reciprocating hook-thread-loop spreader simultaneously spreading said loop in the opposite direction, said spreader consisting of a pivoted lever Z having a lateral arm 70 provided with the notched end, and mounted on the pivot m pendent from the Work-plate, so as to swing close under the work-plate, said lever havingthe lateral and pendent arm 0, connected with an eccentric s on themain shaft.

Signed at New York city this 25th day of February, 1901.

HERMANN A. KLEMM.

Witnesses:

(J. SEDGWICK, A. P. THAYER. 

